I see a backup breaking ball posing a tremendous issue. Hitter is diving over the plate anticipating spin and the ball rides back into him...

A strike is charged when in the umpire's judgment a batter intentionally moves to get hit by a pitch or intentionally allows himself to be hit by a pitch that is not within the batter's box. If there was no intent, the batter should be awarded first base unless the pitch was in the strike zone.